Yeah I tried making one but I could never get the facial expression right, and the muscle structure and the original logo's emboss/statue-like nature was similarly elusive. Never got it to a stage where it was acceptable or notably better than the version I posed ages ago.
I like this version, even though the position of the lion is actually a far cry from the original (hands inverted, left hind leg too high up, and the tail all different) it is still instantly recognizeable. The claw marks are excellently done.
Regarding the hammerhead logo, I was extremely lucky to find an image of a hammerhead shark in a posture closely resembling the original. I basically did edge detect on it, doctored it a bit to clean up the lines I wanted to go away, and used the result for the shark's outline. In that case, it worked well. I wouldn't like to try it on most other cases, and the reason I did it was mostly because the original hammerhead shark in the logo was a god-awful mess that I couldn't really trace draw around (plus it was kind of badly drawn too I think).
In 70th logo, the original includes a heraldic lion which is a different beast entirely than a real lion. Real lions do not climb on their hind legs and wave their forepaws around in the air while snarling viciously. Bears do, but they still don't resemble the actual heraldic Rampant attitude.